Method of controlling gastropods

ABSTRACT

WHEREIN R is selected from the group consisting of unsubstituted phenyl, substituted phenyl and naphthyl, R1 is hydrogen, lower alkyl, alkenyl, aralkyl or an acidifying group; or the salts of these compounds with inorganic or organic bases.   Molluscicidal preparations are provided containing a suitable carrier with, as the active agent, a compound of the formula

United States Patent [191 Duerr et al.

[in 3,821,400 I45] 'June 28, 1974 METHOD OF CONTROLLING GASTROPODS [75] Inventors: Dieter Duerr, Bottmingen; Hans Aebi, Reinach/Basel-land; Ludwig Ebner, Stein/AG, all of Switzerland [73] Assignee: Ciba-Geigy AG, Basel, Switzerland [22] Filed: Mar. 20, 1968 [2]] Appl. No.: 714,406

Related US. Application Data [63] Continuation-impart of Ser. No. 424,820, Jan. 11,

I965, abandoned.

[30] Foreign Application Priority Data Jan. l3, l964 Switzerland, 306/64 Aug. 12, I964 Switzerland l0543/64 [52] US. Cl. 424/304, 71/83 [51] Int. Cl. ..H01n 9/12 [58] Field of Search 424/304 [56] References Cited UNITED STATES PATENTS 3,238,092 3/1966 Boyce ct a1. 424/230 3,287,102 ll/l966 Olin. ..7l/98 Primary ExaminerAlbert T. Meyers Assistant Examiner-Leonard Schenkman Attorney, Agent, or Firm-Ftederilck H. Rabin; Edward 1. Sites; Joseph G. Kolodny wherein R is selected from the group consisting of unsubstituted phenyl, substituted phenyl and naphthyl, R is hydrogen, lower, alkyl, alkenyl, aralkyl or an acidifying group; or the salts of these compounds with inorganic or organic bases.

I 2 Claims, N0 Drawings METHOD OF CONTROLLING GASTROPODS CROSS REFERENCE in which R represents a mononuclear or binuclear aromatic radical which may be substituted by one or more halogen atoms, a lower alkyl group, an alkoxy group, a halogenoalkyl or an alkylmercapto group or by the groups -NO -CN,

By virtue of their broad biocidal activity, the new preparations have the special advantage that they can be used for combating a very wide variety of vegetable and animal pests.

They are not only suitable as herbicides but, when used in a concentration that is insufficient to produce phytotoxic effects, they are extremely active against (wherein A and A each represents a hydrogen atom and/or a lower alkyl group), and R represents a hydrogen atom, a lower alkyl, or alkenyl group containing 1 to 4 carbon atoms, an aralkyl group, an acyl group or aroyl group or the group (wherein X stands for oxygen or sulfur, B and B are identical or different and each represents hydrogen, a lower alkyl or aryl group) or the group X if??? (wherein X and Y are identical or different and each represents oxygen or sulfur, and D stands for a lower alkyl group, an aralkylor an aryl group) or salts of such compounds with inorganic and organic bases together with a suitable carrier.

The preparations may also contain, if desired, one or more of the following additives: a vehicle, a solvent diluent, a dispersant, a wetting agent, an adhesive, a fertilizer and other pesticides.

As mentioned above, the radical R may be unsubstituted or substituted, for example it may be substituted by one or more halogenoalkyl or alkylmercapto groups. If R, is an alkyl group, it may be interrupted by an oxygen or sulfur atom. If the radicals B, B and/or D represent aryl radicals, they may contain the same substitucuts as the radical R. If R, is aliphatic, it may contain halogen atoms.

harmful microorganisms, for example fungi such as Altemaria solani, Phytophthora infestans and Septora apii, and also against harmful insects, acarides, molluscs, nematodes and their ova and larvae.

Quite generally, the new preparations may also be used as microbicides, for example against Aspergillus species and as insecticides, for example against midges and flies. t

In the manufacture of solutions of the compounds of the general formula (I) ready for spraying there may be used, for example, petroleum fractions having a medium to high boiling range, for example Diesel oil or kerosene, coal tar oil and oils of vegetable or animal origin, as well as hydrocarbons, for example alkylated naphthalenes, or tetrahydronaphthalene, if desired in admixture with xylene mixtures, cyclohexanols or ketones, also with chlorinated hydrocarbons for example trichloroethane and tetrachloroethane, trichloroethylene or triand tetrachlorobenzene. It is advantageous to use organic solvents that boil above C.

It is especially advantageous to prepare aqueous forms of application by adding water to emulsion concentrates, pastes or wettable spray powders. Suitable emulsifiers or dispersants are non-ionic products for example condensation products of ethyleneoxide with aliphatic alcohols, amines or carboxylic acids having a long hydrocarbon chain containing about 10 to 20 carbon atoms for example the condensation product of octadecyl alcohol with 25 to 30 mols of ethylene oxide, or of soybean fatty acid with 30 mols of ethylene oxide, or of commercial oleyl-amine with 15 mols of ethylne oxide, or of dodecylmercaptan with 12 mols of ethylene oxide. A suitable anionic emulsifiers, there may be mentioned for example, the sodium salt of dodecyl alcohol sulfuric acid ester, the sodium salt of dodecyl-benzene-sulfonic acid, the potassium or triethanolamine salt of oleic acid or abietic acid or of a mixture of these two acids, or the sodium salt of a pctroleumsulfonic acid. Suitable cationic dispersants are quaternary ammonium compounds, for example cetyl pyridinium bromide or dihydroxyethyl benzyldodecyl ammonium chloride.

In the manufacture of dusting and casting preparations, there may be used as solid vehicles: talcum, kaolin, bentonite, calcium carbonate, calcium phosphate or coal, cork meal, wood meal or other materials of vegetable origin. It is also very advantageous to manufacture preparations ingranular form. The various forms of application may further contain the usual additives capable of improving the distribution, adhesion, stability to rain or penetration; as such substances there may be mentioned fatty acids, resins, glue, casein or alginates.

The preparations of the invention may be used by themselves or in conjunction or in admixture with other conventional pesticides,- especially insecticides, acaricides, nematocides, molluscicides,bactericides, fungicides and/0r herbicides.

Particularly suitable for combating harmful insects and their ova are those new preparations which contain as active substance, a compound of the formula l CH: CH:

HgC-Q-N-C s-oN Harmful microorganisms, especially phytopathogenic microorganisms, can be combated especially effectively with those new preparations which contain as active substance a compound of the formula and Especially good results in the selective or total herbicidal control or undesired plant growth are those preparations of the invention which contain, as active substance, a compound of the formula in which X and Y are identical or different, and each represents a chlorine atom, or an alkyl or alkoxy group containing one to four carbon atoms, or the group CF;,, and R represents a hydrogen atom, or a methyl or ethyl group, a lower carbalkoxy group, or a carbamoyl group substituted by one or two lower alkyl radicals.

Preparations especially suitable for defoliating cotton are, for example, those which contain as active substance a compound of the formula Harmful or undesired molluscs can be combated particularly effectively with those compounds of the formula (I) in which R represents the a-naphthyl radical or a phenyl group substituted by chlorine, methyl and- /or trifluoromethyl groups, and R represents a hydrogen atom or a methyl, ethyl or crotyl group.

As compounds having a good acaricidal effect there may be mentioned, for example, the new compounds of the general formula (I) in which R represents a phenyl radical substituted by one to three halogen atoms or by a methoxy group, and R represents hydrogen, a methyl, ethyl or crotyl group.

The present invention further includes the new compound of the general formula (wherein B, B, D, X and Y have the above meanings); furthermore the compounds of the formula wherein R represents a methyl or ethyl group, and

in which R has the same meaning as in the above general formula (1).

Thereare obtained solutions of the corresponding metal salts, from which the free thioamide can be liberated by acidification. The N-alkylation is carried out in the usual manner, for example with the aid of an alkylhalide or dialkylsulfate. I

The N-acylation can be achieved with the aid of an acid anhydride or acid halide. If it is desired to introduce a carbamoyl group, this can be done with the aid of a suitable isocyanate or an N-substituted or N,N- disubstituted carbamylhalide.

A carbalkoxy or carbaralkoxy or carbaroxy group can be introduced with the aid of a suitable halogenocarbonate, for example a haloformicacid ester.

The following Examples illustrate the invention:

EXAMPLE 1 a. N-Cyanthioformyl-3,4-dichloroaniline 36.7 grams of 3,4-dichlorophenylisothiocyanate in 100 ml of alcohol were stirred for 4 hours with a solution of 13 grams of potassium cyanide in 150 ml of wa- A mixture of 215 grams of 4-chloro-3-trifluor orne thylphenyl isothiocyanate, 60 grams of potassium cyanide. one-half liter of water and 200 ml of methanol was stirred for 12 hours at room temperature, then filtered, the filtrate dilute with water to about twice its initial volume, acidified with concentrated hydrochloric acid, and the precipitate formed was filtered off. 1t

formed orange-yellow crystals melting at 130 to 132C (from benzene petroleum ether).

EXAMPLE 2 a. 123 grams of 2,4-dichlorophenyl mustard oil, 250 ml of methanol, 250 ml of water and 39 grams of potassium cyanide were stirred until a homogeneous solution had formed which was filtered and then used for the following reactions after having been divided into three equal portions. y b. N-Qanothioformyl-Z,4-dichloroaniline One third of the above solution was diluted with onehalf liter of water, and rendered acid to Congo red with 4N-hydrochloric acid. The resulting precipitate of thioamide was collected and dried. Yield: 42.2 grams. After recrystallization from benzene+petroleum ether, the product decomposed at 121C. c. N-Cyanothioformyl-N-methyl-Z,4-dichloroaniline The second portion of the reaction solution obtained under (a) above was mixed with 20 ml of dimethylsulfate while being vigorously stirred. A reaction set in, the whole heated up and the batch solidified; it .was then diluted with 200 ml of l:2-alcohol+water, and after 5 hours the yellow crystals of the thioamide were suctioned off. Recrystallization from aqueous alcohol yielded 33 grams of the product melting at to 76C.

d. N-Cyanothioformyl-Nethyl-2,4-dichloroaniline The third portion of the reaction solution obtained under (a) above was stirred for 5 hours with 26 ml of diethyl sulfate. The resulting reaction solution was diluted with 600 ml of water, and the precipitated oil was isolated and distilled under vacuum; it boiled at 108C under a pressure of 0.09 mm Hg. Yield: 32.5 grams.

The following compounds were likewise manufactured by the methods described and used in Examples 1 and 2.

TABLE I Melting or decomposing B.P., No. R= R1= point, 0. C./mm. Hg

2. Same as above CH 82 84/0.15 3 0 CzHs 82 70.13

4. H NIB-137 6. Same as above 0H1 8991/0. 15

CFs

8 Same as above CH3 102/0.05

10.... Smuuusubovu 11; 10S/0-23 11 .tll) C 1l2.)-l/0.05 12-- 01 CH; 7276 123/0 .l1

TABLE I-Continued TABLE I-Continued Melting or Melting or decomposing B.P., decomposmg B.P., No. R= R1= point, 0. C./mm. Hg No. R= R1= point, C. C./mm. Hg

13.... Sameasabove mo 0.03 50...- (|)CH= H- max-109 H W Q 01 51- Same as above CH; 103/0. 1 52 0 CzHs 1l5/0.09 94.5/0.12 103l05/0. 09 53. 0 CzH5 H 76. 5

H Q CH3 54.... Sameznsabove CH 1223/09 18.... Sameasabove CH3 91-93 .06 55 "do 62H! in 114/018 19 ..dO CzHa 9597/0. 01 56.--. OH H 125 20. H 134-135. 5

CHz

1 Same as above. lggZ/O. 3g

1 0. 21.-.. Sameasabove CH3 5253 121/0.1O o 'm' 22 .-do c2115 1o4 0. 02 I H 124 23.... C H 0 H s4.5-s5 Q- 24.... Same as above CH pig-150 0.6 60-..- Sameas above CH3 77- 548. 5 25 -.do c 11 144-145 a27 25 .-do 02H. 162164/0.68

26 H 11g-120 62.-.. 01 H 82-83" CH3O 27.... Same as above CH3 108/0. 01 28 .-dO CZHE 108109/0.035 30 F 9 H 108 no 5 63 Same asabove CH3 78/0. 013

64 .-dO CgHs 9570.

30.... Same as above CH3 96/0.06 a1 ..do C2H5 1o7-1oa o.45 N

CHaQ 66.... Sameasabove CH3 81.5-82 67.-.. H 61-62 33---. Same as above 0H s0-90/0. 2 OZN 34 ..do 164-166/14 35.... n 114.5-115.5 H 168 CZIIgO 36.... Same as above CH 53-54 37 ..(10 C211 137/0.1 38 H 1430 69--.- 01 H 120 cmo H 39. Same as above CH3 79-80. a 40 ..dO CQHfi 143145/0.3 70-... Sameasabove CH 92/0.05

41.-.. O H H 7a-75 11--.- 01 H 132 4 0 42--.- Sameasabove CH3 114-11s o.2 Q 43 .-do C211 126/0.2 (E

C1 72.... Same as above CH5 7576 73 ..do CzHs 123/0. 32

CF: 74-... OH H 7677.5

3 45. Same as above CH3 104-106/0. 1 46.. ..dO C2115 103/0.015 NO 7 47.... CH; H 64-65" 75.... CH3 H 107 4n. 4 Hnllm m4 nlmvu. UH, H3/0.02 40... ..(lo Hulln HIP/0.02 70.... Bmuuuflnlmvu....... (Hln 07437.5

TABLE I-Continued TABLE Iii-Continued Melting or B.P., B.P. 0/ MR, decomposing No. R= R mm. Hg C. No. R: R1= point. C. C./mm. Hg

77..-- B Q B 133.5-135 102... Q Ally] s/0.o2

78 Same as above CH; 108/0.08

| 10 103..- Same asabove Ethyl 1349/0. 02

61 EXAM??? 2 80.... 31 H res-137 l5 CFa t CO-NHCI Using those compounds in which R represents a hy- A few drops of an organic base, for example triethylamdrogen atom, there were prepared salts with alkali, a1- kaline earth and heavy metals, or solutions or suspensions of such salts, whose effect was approximately equivalent to that of the free acids.

The primarily formed salt solutions can, if desired, be

used as they are without prior isolation of the salts, if necessary with addition of an emulsifier.

The alkylsulfates may be replaced by other alkylating agents. Thus, for example, when a suitable allylchloride, benzylchloride or chlorodimethyl ether was used under the conditions described in Example 2 (d), the following compounds were obtained:

TABLE II B.P. o./ M.P., 3 No. R-= R1== mm. Hg C. 81.... f E Banzyl /0.03

82.... Same as above 3, 4-dichloro- 189/0.5

benzyl. 4 83 .do Allyl 89/0.02 a'ChloroaHyL"-.- 114/0. 11 85 do Methoxymethyl... 108/0.09

B enzyl 147/0. 04

4-ehlorobenzy1 176/0.25 2-oh1orobenzy1 76. 5 y /8 a-Oh1oroa11y1. 116/0.07

Benzyl 156/0.07 5

97.... Same as above Allyl 170/0.56 60 98.... Bonzyl 83 CHaO- 99.... Sameasabove Ally 134/0. 15

100... Allyl 123/0.1 65

101... Sameas above... u-Chloroallyl 123/0.08

quor. On recrystallisation from benzene the product formed yellowish crystals melting a 151 to 152C. Yield: 39g.

In an identical manner, using the corresponding starting materials, the following substances were manufactured: i

TABLE III No. k In: M.1., O. 104"-.. Q -o oNH-om HIS-136 105..... Same as above C1 192-193 G O-NH Cl 106 3 -G O-NH-CHa 124-125 CHa 107.. Same as above 122123 -C 0-NH C1 108..... G Q -C ONH--CH; 133.13

109 Same as above 186-1 1 -C O-NHQ-Cl 87 110..... Q -o o-nm-cm 142-1 0 111...... Same as above 131-131. 5

. -C 0--NH -C O-NH C1 g -C O-NH-CHa TABLE Ill-Continued No. R R,= M.P..C.

114--. C--NH--CH: 145-146" S as bove 159160 115.. me a C 0 NH l C Fa 118"... Cl -C ONHCHa 120-121.5

. 1.199 111 121"... Q -CONHCHa 146-147,

122 Same as above CONHCOH5 131132, 5

123 -do C1 191 womaQam 124. CONHCH: 116-117 125. Same as above 145-146" -CONH C1 GONH -Cl 127. c1 OO-NHCH 163-164 128.... Same as above "GONHCflH5 192-193 -OONH 130. C1 Cl 179-182" CMHQ 1 1 EXAMPLE 4 C S-CN Q 25 ml of ION-sodium hydroxide solution were added to a solution of 40.5 grams of compound 1 in 150 ml of dioxane, and while cooling with ice, 39.2 grams of phenylchlorocarbonate were run in the course of 10 minutes. After 30 minutes, the products was precipitated in the form of red-brown crystals by adding about 1 liter of ice water. The crude product can be purified by recrystallization from mixtures of benzene and petroleurn ether, if necessary with the aid of animal charcoal. Yield: 71 percent of the theoretical yield. The product melted at 145 to 146C.

In an identical manner, using the corresponding starting materials, the following compounds were manufactured:

TABLE IV d Meltingi or ecompos 11 No. R: R1: point, C

131 Q 0 O0 CH1 129130 182 Same as above O O-O C2H5 108-109" 133 Q C 0-0 CH; 143-146 134 Same as above C O-O 0 H; -106 135 .do C 0-O 04H (1) 6768 136 C O() CH3 108-109.5

137 Same as above C 0-0 0 H; 87-89 138. (10 0 O0 CoHs 138-139 139 Q COOCHa 156-158 140 Same as above -0 O-0 CzHa 102403 141 O 0-0CH: 121123 142 Same as above -COOC;H5 Mil-120 143 o C00CaH 129-1311 144 C O-O CH3 135'136 145 Same as above C O-O CQH5 122.5124.5

146 C O-O CH3 162-163 CHaO- 147 (3H -C O-O 00H; 138.5139.5

EXAMPLE 5 C 8 -CN Q- CHz-CH=CH=CH3 a. N-Cyanoformyl-3-chloroaniline:

A mixture consisting of 750 ml of methanol, 1000 ml of water, 200 g of potassium cyanide and 510 g of mchlorophenylisocyanate is stirred for 15 hours at room temperature. The reaction product is diluted with 2000 ml of water, the minor impurities are filtered off, and

Yield 540 g; melting point 86 to 91C. Recrystallisa-- tion from a mixture of chloroform and petroleum-ether brings the melting point to 89 to 915C. b. Crotylisation:

46.5 g of product (a) are stirred together with 100 ml of methanol, 150 ml of water 25.4 g of 86 percent potassium hydroxide and 55.5 g of crotylbromide at 60C. Three hours later 500 ml of water are added and the oil formed is separated. The aqueous phase is extracted once with chloroform, the chloroformic solution added to the separated oil, and the whole dried over sodiumsulfate. After being filtered off from the siccative the oily phase is destilled under reduced pressure. Yield: 69.5 g of N-cyanothioformyl-N-crotyl-3-chloroaniline; boiling point 125C at 0.2 mmHg.

EXAMPLE 6 10 Parts each of one of the compounds of Example 1 and 2 were mixed with parts of xylene andlO parts of a mixture of an anionic surface-active compound, preferably the calcium or magnesium salt of monolaurylbenzene-monosulfonic acid, with a non-ionic surfaceactive compound, preferably a polyethyleneglycol ether of the monolauryl ester of sorbitol, and then diluted with xylene to 100 cc. .A clear solution was obtained which could be used as a spray concentrate, and could be emulsified by being poured into water.

EXAMPLE 7 A. Herbicidal effect Earthenware pots filled with earth were seeded in a greenhouse with the following seeds: Avena sativa, Setaria italica, Sinapis arvensis and Lepidium sativum.

a. The pre-emergence treatment was carried out 1 day after seeding, with spray broths prepared as described in Example 6 which contained, as active substances, the compounds of Example 2(b) and with compounds nos. 13, 15 and 16 in Table l. The amount sprayed corresponded to kilograms of active substance per hectare. The results achieved were assessed about'20 days after treatment. b. The post-emergence treatment of the abovementioned plants was carried out as described under (a) above, but only about 10 to 12 days after seeding, when the plants had developed the second leaf. The amount sprayed corresponded to 10 kilograms of active substance per hectare. The results were assessed about 18 days after treatment. The results obtained are known in the following Tables:

(a) Pre-emergence treatment (b) Post-emergence treatment Plant tested Amount Ex. Ex.2 Ex.2 Ex.2 sprayed 2(b) Tb.l Tb.l Tb.l in kilo- No. No. Nov grams per l3 l5 l6 .hectare Avena sativa 10 10 4 6 3 Setan'a italica 10 10 10 10 10 Sinapis arvensis l0 l0 l0 l0 l0 Lepidium sativum l0 l0 l0 5 6 Classification: 0=no effect 1| 0=plant completely killed off A similar good e'fi'ect was also obtained with compound Nos. 5,9, 10, 14, 16, 17, 20, 21,23, 26, 29, 32, 38 and 41 of Table I of Example 2.

Similar good results were also obtained when using compounds Nos. 13, 30, 45, 47, 50, 56, 62, 71, 73, 104 and 132 shown in Tables 1 to 1V and with the compound of the formula CH3 (decomposes at 120C) (B) Ovicidal effect Compounds Nos. 2, 3, 9, 10, 11., 12, 13, 15, 1'6, 18 and 21 shown in Table I of Example 2 destroyed completely the ova of Ephestia Kuehniella (flour moth) even at as low a concentration as 0.0125 percent.

Compounds 27, 28, 34, 36 and 97 were equally effective.

Good effects against flour moth ova and the ova of Aphis pomi in open country were achieved with compounds 10, 12 and 20. Compound No. 21 proved effective against the aforementioned pests andthe ova of winter moth, and compound No. 18 against the flour moth and winter moth. The following compounds proved to be potent acaricides: Nos. 10, 11, 13, 16, 52 and 79.

(C) Fungicidal effect The cotyledons of Cucumis pepo and young tomato plants were treated with a suspension prepared according to Example 3, containing 0.2 percent of the active substance No. 23 shown in Table l. of Example 2.

2 Days after the treatment, the cotyledons of Cucumis pepo were infested with spores of Erysiphe cichlon'acearum and the tomato plants with a spore suspension of Alternaria solani.

5 Days after infection of the tomato plants, the tomatoes treated with the spray broth of Example 3 were completely clear in contrast to the control plants which were strongly infested. An assessment of the result achieved, made 12 days later on the cucumber plants,

revealed a percent success against Erysiphe cichoriacearum. A similar good result was also obtained with compounds 22 and 31 of Table l in Example 2(b).

92, 93, 100 and 103 and with the compound of the for-,

mula

(D) Defoliation of cotton A cotton field was treated with a spray broth prepared as described in Example 3, containing 0.5 percent of compound No. 9 of the Table of Example 2. Within 7 days a defoliation effect of at least 80 percent of the c enrplants ashieyst (E) Acaricidal effect The compound of Example 5 was fonnulated in the usual manner.

To check its acaricidal effect, Phaseolus plants in the 2-leaf stage are infested 12 hours before the treatment by covering them with pieces of leaves infested by a mite species (Tetranychus telarius; carrnine red mite.) 12 Hours later, the test plant was found to be covered with mites in all stages of development. The active sub- I stance, in the form of an emulsion, was sprayed with the aid of a fine sprayer over the plants in a'manner such that a uniform layer of droplets was formed on the leaf surface. The mortality was checked 2 and 7 days later and expressed in percent. The effect upon ova after thetest had been run for 2 days as described cannot be stated because the average time taken by the'larvae to leave the ova has not yet been established At a concentration of 0.08 percent of active substance the following mortality values were found:

Adults Ova Larvae after 2 days v after 7 days 100 Equally good results were obtained with compounds nos. 10, ll, l2, l3, l5, l6, 18, 20, 21, 27, 28, 34, 36, 52, 79, 97, 144.

EXAMPLE 8 The following genera and species of snails can be successfuly combated with such compounds and those of similar constitution: Edible snails (Helix), common European black slug (arion), salad slugs, gastropon molluscs (Limax), Deroceras, Biharzia slugs, Planorbis, Bulinus, Biomphalaria and the like.

EXAMPLE 9 Several of the compounds obtained by the present invention were tested for the action against the following bacteria and fungi:

Staphylococcus aureus, Escherichia coli, Aspergillus niger and Rhizopus nigricans. In these tests, the following compounds proved efficacious in a concentration of parts per million or less: Nos. 67, 76, 79 and 80.

The following compounds were highly effective against the fungi mentioned above:

Compounds of Example 4, 1(a) and l(b) and compounds Nos. 2, 10, 14 to '17, 20, 21, 35, 41, 59, 60, 62, 65,71,74, 85,97, 99, 104, 108, 110, Ill, 114 and 117-.

Very good bactericidal effects were also achieved with the compound Nos. 105, 119, 124 and 144.

What is claimed is:

l. A method, of destroying gastropods which comprises contacting the gastropods with a gastropodicidally toxic amount of the thiooxanilonitrile of the formula:

2. A method of destroying gastropods which comprises contacting the gastropods in their water habitat with a gastropodically toxic amount of 3,4-dichlorothiooxanilonitrile.

. s as 

2. A method of destroying gastropods which comprises contacting the gastropods in their water habitat with a gastropodically toxic amount of 3,4-dichlorothiooxanilonitrile. 